Hi guys,I bought a BSNL 3G modem with relevant datacard (i.e. SIM card) in Jaipur.However, now I've shifted to Delhi and want to use the same modem, but plug in a MTNL datacard.I had a couple of questions:a) Is it actually possible to use MTNL sim with BSNL modem? The guy I bought it from said that the modem is 'unlocked'b) Is MTNL a good option in Delhi? How are Reliance and Tata Indicom?c) Do companies even sell data cards individually without the modem?Thanks in advance guys for whatever inputs you can give me